35 Ill. Adm. Code 244.106
Monitoring
Section 244
Section 244.106 Monitoring
a) Monitoring stations used to determine advisory, alert or
emergency levels shall be located according to Federal guidelines for
establishment of air quality surveillance networks and shall use measurement
methods or equivalent methods as officially authorized by the United States
Environmental Protection Agency (USEPA).
b) Whenever any monitoring station registers air contaminant
concentrations in excess of advisory or alert levels, proper operation of the
sampling equipment at such stations shall be verified by the Agency or any
agency cooperating with the Agency before the concentrations are used to
declare any advisory, alert or emergency stage.